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nvmet-loop: Flush nvme_delete_wq when removing the port

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[ Upstream commit 86b9a63e59 ]

After calling nvme_loop_delete_ctrl(), the controllers will not
yet be deleted because nvme_delete_ctrl() only schedules work
to do the delete.

This means a race can occur if a port is removed but there
are still active controllers trying to access that memory.

To fix this, flush the nvme_delete_wq before returning from
nvme_loop_remove_port() so that any controllers that might
be in the process of being deleted won't access a freed port.

Signed-off-by: Logan Gunthorpe <logang@deltatee.com>
Reviewed-by: Sagi Grimberg <sagi@grimberg.me>
Reviewed-by: Max Gurtovoy <maxg@mellanox.com>
Reviewed-by : Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com>
Signed-off-by: Sagi Grimberg <sagi@grimberg.me>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Logan Gunthorpe
2019-07-31 17:35:32 -06:00
committed by Greg Kroah-Hartman
parent 19620ce482
commit 938f8292e9
1 changed files with 8 additions and 0 deletions
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8
drivers/nvme/target/loop.c
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@@ -654,6 +654,14 @@ static void nvme_loop_remove_port(struct nvmet_port *port)
mutex_lock(&nvme_loop_ports_mutex); mutex_lock(&nvme_loop_ports_mutex);
list_del_init(&port->entry); list_del_init(&port->entry);
mutex_unlock(&nvme_loop_ports_mutex); mutex_unlock(&nvme_loop_ports_mutex);
/*
* Ensure any ctrls that are in the process of being
* deleted are in fact deleted before we return
* and free the port. This is to prevent active
* ctrls from using a port after it's freed.
*/
flush_workqueue(nvme_delete_wq);
} }
static const struct nvmet_fabrics_ops nvme_loop_ops = { static const struct nvmet_fabrics_ops nvme_loop_ops = {